Questions tagged [performance]

Questions pertaining to software performance or computational speed of Blender should use this tag. (Do not ask hardware specific questions. They are considered off-topic)

144 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
5
votes
0answers
115 views

Cycles Renderer - Updating Shaders and Images Every Frame?

This question is more of a curiosity to the potential of increasing render times, however, after finding very little out about this anywhere else, I am thinking it may be an intentional feature. I am ...
4
votes
0answers
58 views

Hacks for improving performance on large scenes

Hi I’m using blender mostly doing exterior architecture visualisations. Through previous months I’ve found many problems that affects this software. But the main issue is lack of performance power ...
3
votes
1answer
271 views

Render is much faster when laptop is plugged in and charging

My laptop seems to be rendering infinitely faster whilst charging then it does when it's not charging for some reason. My setup is an i7 9th gen w/ an RTX 2060. I'm rendering using OptiX. As can ...
3
votes
0answers
145 views

Does decimate help viewport performance?

I'm seeking to increase viewport performance to help when posing/animating. Does it work to just toss a decimate on my objects? Will this actually help performance, or just add the extra calculation ...
3
votes
0answers
1k views

Why does it take so much longer to track uncached frames?

I'm attempting to track a slightly longish shot, and I don't want to fill up all my ram. I can play the animation with ⎇ AltA and blender caches and displays uncached frames in near real-time (~...
2
votes
0answers
123 views

Blender too slow for my new computer?

I just bought a new computer and I was following the donut lesson of Blender Guru. When I raise up the number of subdivision of the donut (Viewport) to 3, the problem starts. I can not smoothly move ...
2
votes
0answers
30 views

Is there any way to prevent Freestyle from wasting time calculating objects that were excluded from rendering?

I love making animations that use high amounts of reflective surfaces, and recently have been trying my hand at Freestyle which is amazingly fun. In my current project, I am trying to make only one ...
2
votes
1answer
356 views

Performance: Eevee vs Blender Internal

In my application I use Blender's Internal rendering engine (headless mode) to render quick mock-ups of various items. BI yields plenty quality, however speed is essential (it's a web app) and I wish ...
2
votes
0answers
42 views

Screw Modifier Best Practices

I am creating a three-strand rope in blender using the screw modifier and was wondering what might be best practices for making a long rope. Essentially it is a choice between iterations or degrees. I ...
2
votes
0answers
45 views

Recurring issue, Can anyone help me fix Blender hanging before the file browser appears?

I have been using Blender for a little over five years now and just recently it has started to freeze up or hang whenever I click any button that activates the file browser. Whether it be browsing for ...
2
votes
0answers
2k views

make blender faster while working. not concerned about render speeds

So, to start off. I'm a member of cgcookie.com. they offered some pretty good tips, like turning of VBO and stuff. Still, I just feel like for having an home built i5 and an GTX970 card and 16GB of ...
2
votes
0answers
272 views

Creating/Handling pathfinding large world waypoints in Blender

I am trying to create an importer/exporter script for an open world's game map. However, I am being constantly hit and set back by performance of blender. I want to be able to create way points for ...
1
vote
0answers
38 views

2.91 viewport lag after certain amount of time

When I open Blender it runs perfectly smooth, but after a while it begins to lag. I close and open the same file and it runs smoothly again, until about fifteen or twenty minutes pass and it starts ...
1
vote
0answers
25 views

playing with View Layers - are they always all rendered?

I'm playing with View Layers since I have to separate a lot of stuff from a scene. It's working great but I was wondering how it does impact the render performances. If I have, let's say, 10 View ...
1
vote
0answers
54 views

Script performance issues. Applying modifiers to mesh with shape keys

I didn't write the script, I can read it, but can't do much else. This script is used for applying subdiv to a mesh with shapekeys, while preserving the latter. However it seems to be leaking a lot of ...
1
vote
1answer
26 views

Animated text body drops Playback FPS by half

I'm developing my first Add-On, its main purpose is to visualize Scientific Data (BlenderNC), I'm using Blender v2.83 (Mac OS 10.15.5, 16GB RAM, Radeon Pro 555 2 GB). As a feature, I want to animate ...
1
vote
0answers
112 views

Heavy Boolean Operations

I was wondering why boolean operations are hard to compute for pc, ı got one desktop and one laptop , and uses 2 different operating system , but in all systems stiuation is the same. I am using ...
1
vote
0answers
46 views

EEVEE Adding noise texture lags out renderer

I'm trying to make a Dr. Strange style shield, I've got the lighting down, but whenever I add the noise texture to vary the light on the shield, it lags out whenever I try to render the animation. Any ...
1
vote
0answers
26 views

Are there any settings I can tweak to speed up blender?

I'm running blender on an older computer and it is a bit sluggish. Are there any settings I can change to get better performance out of the UI? I'm using blender 2.8
1
vote
0answers
128 views

Limits of uv unwrapping in blender 2.80

I've been researching how Blender uses the CPU. It seems each algorithm is different where some may use all cpu cores, others may only use 1 or 2 cores. I am trying to unwrap a very high poly count ...
1
vote
0answers
236 views

Why is my viewport performance (a lot) slower when using solid mode compared to rendered (eevee or cycles)?

When I use solid mode for my viewport Blender suddenly becomes very slow and laggy. I can still move the camera around or change stuff, but only with a lot of delay. When I switch rendered mode the ...
1
vote
0answers
28 views

Confused by the difference in render time between two projects

I'm still a beginner with Blender (been doing stuff occasionally for a year now), so I've got no knowledge about the intricate technicalities of rendering but this is the first time I'm really ...
1
vote
0answers
22 views

swap “disable in viewports” and “disable in renders”

I'm working on a big project and to improve performance I have hidden a lot of modifiers and objects in viewports. But now I want to see how the current full version of the project looks like in ...
1
vote
0answers
43 views

How much would Blender benefit from multiple core / threads?

I'm currently building a PC for game development (and regular gaming of course :P) and I have all of my parts chosen (Radeon RX 580, 16gb Corsair vengeance, 256gb m.2, 1 TB HDD, MSI B450 Gaming Plus) ...
1
vote
0answers
87 views

What graphics card is faster than i7

I have a 5th generation MSI BOARD, H77MA-G43 with 16 Gig ram and CPU: i7 3770|3.4GHz. I render within cycles, the render time of the i7 CPU is 5 times faster than the GeForce Gtx 1050 ti What graphics ...
1
vote
0answers
109 views

Script runs very slow when changing parameters in Add Object menu

I've made my first addon based on an internal blender Text editor template. It is used to add primitive meshes and then control some of their aspects, much like adding primitives like Cubes or UV ...
1
vote
0answers
106 views

Blender Benchmark crashes

I tried to run Blender benchmark because I felt it was a bit slow today working and the GPU was being used intensively in the task manager while sculpting, and I didn't used my new laptop for 3d too ...
1
vote
0answers
141 views

Viewport performance, i9-9900k vs Ryzen 3970x?

(Apologies in advance in case this is the wrong place to ask this!) I'm building a new workstation and trying to decide which CPU to go with. Does the viewport performance in Blender benefit from ...
1
vote
1answer
3k views

Is there a way to determine why Blender is running so slow?

I have a pretty large project (about 1GB, 4 scenes) and recently Blender has become too slow too use. A couple of annoying things, other than just lagging are: I can not scale or move objects with ...
1
vote
0answers
190 views

No render speed difference in Eevee cpu vs gpu

My gpu got damaged last night so I removed it and started using blender with cpu only. I found that there is no difference in render speed or performance between cpu vs gpu. 2 second per frame on cpu ...
1
vote
0answers
64 views

Cycles: Build without SSE and AVX

I am trying to benchmark Cycles performance without SSE, with SSE only, and with AVX instructions. I am finding weird behavior where if I switch off the "WITH_CPU_SSE" flag in CMakeLists.txt, the ...
1
vote
1answer
466 views

Slow Playback of mocap data

I downloaded Animations from mixamo to import into my scene. In the mixamo webapp the animation plays back at 100fps. In Blender 2.8, its 7fps. Solid mode, no modifiers, no materials. No other ...
1
vote
0answers
401 views

Where are the settings to increase cycles threads?

I am trying to adapt the cycles render code to allow me to use the full threading power of my GPU (Radeon RX750 8Gb, 2048 OpenGL threads). There seems to be a limit from some time ago of 1024 threads, ...
1
vote
0answers
164 views

Is Static / Dynamic BVH still present in recent builds of 2.79?

There still is Static / Dynamic BVH dropdown in official 2.79 build: That dropdown to choose between them isn't present in recent builds of 2.79 or 2.8 anymore. Viewport resolution only seems to be ...
1
vote
0answers
199 views

is it possible to limit texture resolution by distance?

I know in the simplify tab you can set a reduced texture size for all of the scene, but is it possible to reduce the texture size in vram based on distance from the camera? For example I have a 2km ...
1
vote
0answers
129 views

Blender file size increses drastically after joning duplicated object and performs very slow

When i join (CtrlJ) duplicated (ShiftD) multiple object or mesh then blender performs very slow and file size increases too from 100mb to 1gb. Does anyone have solutions for this issue?
1
vote
0answers
756 views

Blender 2.79 Cycles OpenCL RX Vega GPU extremely slow. (Ubuntu 18.04)

I am running Ubuntu 18.04 on a fairly powerful PC (Ryzen 2700x and Vega64) I finally managed to get OpenCL to work at all with ROCm-rehl drivers. When I render the default cube scene CPU rendering ...
1
vote
0answers
651 views

Blender does not seem to utilize CPUs and GPUs effectively for rendering

I've just built myself a new machine because rendering times on my laptop were prohibitive. It's an i7900 10 core processor, 32GB RAM and two Quadro P4 graphics cards with 8GB memory each. The cards ...
1
vote
0answers
277 views

Struggling with making an audience/public for an gladiator arena

I am a blender newbie, slowly catching up with the program and geting into 3D modeling. I've managed to create a huge arena model, and I have a lot of audience seats that should eventually be filled ...
1
vote
0answers
157 views

Blender 2.76b - Slow performance on Viewport Shading Material

I'm running Blender on Ubuntu 18.04 LTS; I use Blender 2.76b. My problem is when I turn the Viewport Shading to Material Mode, it is very very slow. It is even much slower (much!) than the Rendered ...
1
vote
0answers
56 views

Performance issues - make tree leaves like this?

Ok, I am trying to achieve animated, particle like leaves (low poly not realistic) like this - https://youtu.be/cKS3VM1a3TU?t=4m8s Obviously my idea was to make a group with some leaves and make a ...
1
vote
0answers
148 views

Imported .obj has too many faces

I imported a .obj file created with osm2world, and even though the imported objects are all low poly, they have many faces. E.g. this is just a simple plane: but has this many faces: Now my ...
1
vote
0answers
868 views

Video editing performance

I'm trying to edit a video using Blender and the video playback is really slow for some reason. The input video is 3 AVI clips all resampled to 25fps. They were all different framerates, so I used ...
1
vote
0answers
237 views

Speeding up the viewport

I just had a shock when I opened 2.28c (it's been far too long) The drawing was super fast on my EEEPC. All the time I thought my graphics card was slow (and it is by comparison) when actually ...
1
vote
0answers
260 views

Blender command Z is slow?

Alright I'm on mac latest OS, latest blender 2.79 and really just with command Z (this is just since updating) - it takes a WHILE like good 30s to undo something. Modeling, everything else pretty ...
1
vote
0answers
22 views

Multiple of same Render layer performance in the compositor

As far as performance goes, is there any penalty for duplicating the same render layer node multiple times, as opposed to using more noodles from the same node? For organizational purposes, i want to ...
1
vote
0answers
105 views

Performance relating to Object Instances

Just a simple performance question. When using object instances, the same vertex data is used for another object (like an exact duplicate) causing much less memory usage when building up the ...
1
vote
0answers
566 views

Keep images in memory between Cycles renders

I have an application which requires me to render hundreds of thousands of tiny images in Cycles. The scene uses a HDR Light Probe, which is ~100mb uncompressed in VRAM. I've noticed that the ...
1
vote
0answers
305 views

Separate windows are solid black when opening blender

I have a frequent problem where I separate out multiple blender windows onto my secondary screen. These are usually node editors and UV/Image viewer windows. When I re-open blender, often these ...
1
vote
0answers
262 views

Blender snap (linux, specifically Ubuntu 17.04) very slow / freezing when in material view

I recently downloaded the Blender snap from Ubuntu Software because it seems to be always up to date, Then I opened one of my projects to continue working on, then it just freezed for a sec then ...